MOST IMPORTANT NOTE
If you want the bug will be fixed, you have to report it to the Kobo customer services: help@kobobooks.com. Send them bug reports even if the bug is already listed - the more the feedback the higher gets the fixing chance.
If your bug are confirmed as Adobe Digital Editions bug, please report report them also to the Adobe forum.

Before reporting:
Many bugs are caused by database corruptions. First try to reset the databaseas exaplained here.

How to report:
Copy & paste the bbcode below and fill the data (a test document will be appreciated ):

Bug: Incorrect rendering of long paragraphsStatus: ConfirmedDevice: Glo, Touch, Mini, (Aura); General firmware issue for all devicesFirmware: probably around from the first firmware release
Kepub or epub: epub (kepub not sure). Seems a Kobo bug. Other brands using the same (Adobe) RMSDK don't have this bug.